Kelly Osbourne thanks fans after seizure

Reality TV star Kelly Osbourne has thanked fans for their well wishes after she suffered a seizure on Thursday.

Ozzy Osbourne's daughter collapsed while filming her U.S. TV show Fashion Police and was taken to a Los Angeles hospital.

A spokesperson assured fans the star was "awake" and "alert" and was undergoing medical tests, and now Osbourne has opened up about the drama.

The 28 year old took to Twitter.com to upload a picture which shows her lying in a hospital bed with her arm hooked up to a drip, and she revealed doctors are attempting to discover why she suffered the seizure.

In the accompanying post, she writes, "Thank U (you) all 4 UR (for your) beautiful well wishes yes I did have a seizure they are just trying to figure out why?"